About: http://webisa.webdatacommons.org/38648151

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The definition of a controlled trial is an experiment in which all variables are kept reasonably constant except the one being evaluated.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com